College Chemistry

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Please help me. I have worked on this for 2 days. I don't understand the ratio of this equation.4Na+O2 to 2Na2O.
for question: How many grams of Na2O are produced when 81.ograms of Na reacts?

  • College Chemistry -

    A four step procedure will work these problems.

    1. Write and balance the equation.
    You have that.

    2. Convert what you have (in this case 81.0 g Na) to mols. mol = grams/molar mass = ?

    3. Using the coefficients in the balanced equation, convert mols of what you have (Na) to mols of what you want (in this case Na2O).
    ?mols Na x (2 mols Na2O/4 mols Na) = ? mols Na x (2/4) = ? mols Na x 1/2 = ?

    4. Now convert mols of what you want (Na2O) to grams. g = mols x molar mass

  • College Chemistry -

    How many moles of aluminum ions are present in 0.50 mole of Al2(SO4)3?

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